it's only when they lose to the bigger fighter do we hear it. no one complained when Couture was beating Sylvia (at least 270 fight time) and Gonzaga (probably 260 fight time). or Fedor beating 400+ lb Zulu or 330 lb Choi.

You also never hear anybody saying, "It's not fair, Royce Gracie was using his BJJ to his advantage!" Well DUH, of course a fighter is going to use his skills and physical attributes to his advantage!